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The owner of a building or facility in which an FSE is located, and the owner or operator of an FSE, shall be required to install a grease trap, grease interceptor, or other facilities to capture FOG from the waste stream prior to discharge to the POTW, and to thereafter operate and maintain same to meet the limits of one hundred milligrams per liter (100 mg/l) - total FOG as provided in this article. (Ord. 5256, 11-24-2014)
The requirements of section 8-3E-4 of this article shall not apply to that portion of a building or facility within which an FSE is in existence on the effective date if:
A. The FSE has an existing grease interceptor or grease trap in place as of the effective date and provided that: 1) the owner or occupant of the FSE continues to use the interceptor or trap, 2) the interceptor or trap is of sufficient capacity and design, and 3) the interceptor or trap is operated and maintained so as to comply with FOG discharge limits. (Ord. 5256, 11-24-2014)
A. After the effective date, any permitted construction under section 8-3E-4 of this article shall be deemed compliant upon issuance of a certificate of compliance or certificate of occupancy for such construction by the city building official or designee.
B. The existing facilities of an FSE shall be deemed compliant, unless the superintendent, or city building official or designee, determines that an existing grease trap or grease interceptor is incapable of adequately retaining FOG. In such cases, the superintendent may order the FSE to install an adequate grease trap or grease interceptor within a specified time period if:
1. The FSE is found to contribute FOG in quantities above FOG discharge limits; or
2. The FSE discharges necessitate increased maintenance on the POTW in order to keep blockages from occurring therein; or
3. The FSE's discharge to the POTW is at any time determined to exceed one hundred milligrams per liter (100 mg/l) - total FOG.
C. An order directing an existing FSE or the owner or operator of the FSE or the owner of the building or facility in which the FSE is located to install a grease interceptor shall be in writing from the superintendent in the form of a notice of violation including a corrective action order, as provided in section 8-3E-13 of this article.
D. FSEs or owners of buildings or facilities within which an FSE is located which are unable to install or replace a grease interceptor due to exceptional physical constraints or economic hardship may appeal to the superintendent for approval of an alternative grease control technology by requesting a hearing in accordance with the provisions of this article. Such requests shall be submitted in writing and shall include detailed descriptions of the FSE's physical or financial constraints and of the alternative grease control technology which it proposes to install and utilize. Adding emulsification agents or other chemicals or enzymes to the waste stream to address the grease discharge issues from the FSE are not considered acceptable alternatives for FOG removal.
1. Notwithstanding approval of alternative grease control technology, when the superintendent determines that such alternative is not performing adequately, the FSE or owner of the building or facility in which the FSE is located shall be required to take additional grease control measures, which may include the installation of a grease interceptor.
2. In order to demonstrate exceptional physical site constraints preventing the installation of a grease interceptor, the owner or operator of the FSE or owner of the building or facility in which the FSE is located shall submit to the superintendent documentation and plats showing the location of city sanitary sewer and any private easements in relation to the building sewer for the building housing the FSE, and showing available space inside or outside the building and drawings of existing plumbing at or in a site that uses common plumbing for all services at that site.
3. An FSE that is given an exemption from installing a properly sized grease interceptor is prohibited from installing or using a dishwasher or garbage disposal without approval of the superintendent and must comply with the conditions of such approval, if any. (Ord. 5256, 11-24-2014)
Grease interceptors and grease traps, when required, shall be installed as follows:
A. Grease interceptors and grease traps shall be installed at the expense of the owner or operator of the FSE or owner of the building or facility in which the FSE is located which is contributing wastewater to the POTW.
B. All wastewater streams containing FOG or reasonably likely to contain FOG within FSEs or other FOG generating operations shall be directed into one or more appropriately sized grease traps or grease interceptors before discharge to the POTW.
It is the responsibility of the FSE to determine the appropriate sizing of any grease traps, grease interceptors, or other grease removal facilities. The discharge from the FSE shall be operated and maintained by the FSE such that the FOG shall not exceed one hundred milligrams per liter (100 mg/l) - total FOG.
Grease removal facilities may be sized by considering the peak design flow rates for all fixtures leading to the grease interceptor and allowing a minimum retention time of thirty (30) minutes or as follows:
Grease interceptor sizing: |
Grease interceptor sizing: | ||||
1. | Peak meals per hour: | |||
a. Seating capacity of FSE | ||||
b. Occupancy of FSE | 1 | |||
c. Seating or occupancy x meal factor of 1.3 (45 minute meal) = Peak meals per hour | ||||
2. | Waste flow rate, gallons of flow: | |||
a. Commercial, equipped kitchen with dishwasher and 1 garbage disposal2 | 7 | |||
b. Commercial, equipped kitchen with dishwasher, no garbage disposal | 6 | |||
c. Commercial, equipped kitchen with no dishwasher, 1 garbage disposal2 | 6 | |||
d. Commercial, equipped kitchen with no dishwasher, no garbage disposal | 5 | |||
e. Single service kitchen3 | 2 | |||
3. | Retention time, hours: | |||
a. Commercial kitchen | 2.5 | |||
b. Single service kitchen | 1.5 | |||
4. | Storage factor: | |||
a. Commercial kitchen up to 8 hours of operation | 1 | |||
b. Commercial kitchen up to 16 hours of operation | 2 | |||
c. Commercial kitchen up to 24 hours of operation | 3 | |||
d. Single service kitchen | 1.5 | |||
Peak meals per hour | x | Waste flow rate | x | Retention time | x | Storage factor | = | Calculated interceptor size |
Notes:
1. Church: include all area(s) used for meal service.
Assisted living/nursing facility: equal to maximum number of residents (per state license).
2. Each additional garbage disposal, add 1 gallon.
3. Single service kitchen = no garbage disposal, no dishwasher and all service is single use.
It is the FSE's responsibility to size the FOG removal system and to operate it to meet the requirements of this article.
C. Concrete grease interceptors, whether precast or poured in place, shall be designed and manufactured in accordance with ASTM C1613-08 standard specification for precast concrete grease interceptor tanks or IAPMO/ANSI Z1001 prefabricated gravity grease interceptors and shall be installed in accordance with the codes adopted by the city. Grease interceptors using materials other than concrete require approval by the superintendent, and shall comply with the conditions of such approval, if any.
D. The building official or other designated official of the city shall inspect each grease interceptor installation made pursuant to this article, shall review all relevant information regarding the rated performance of the grease interceptor, and the building plan and facility site plan for the building and site where the grease interceptor has been installed, and shall approve such grease interceptor installation upon determination that the grease interceptor meets all applicable standards and requirements.
E. Grease interceptors shall be installed outside the building housing the FSE and below surface grade, and shall have access manholes, with a minimum diameter of twenty four inches (24"), over each chamber and sanitary tee. Access manholes shall extend from the grease interceptor to at least the finished surface grade and be designed and maintained to prevent storm or surface water inflow and groundwater infiltration. The manholes shall also have readily removable covers to facilitate inspection and grease removal.
F. Sewer lines which are not grease laden, which are not likely to contain FOG, or which contain sanitary wastes shall not be connected to a grease interceptor.
G. Grease interceptors shall be equipped with an accessible discharge sampling port with a minimum six inch (6") diameter, which shall extend from the grease interceptor to at least the finished surface grade.
H. Where grease interceptors are shared by more than one FSE, the building owner shall be the responsible party for recordkeeping and cleaning of the interceptor. (Ord. 5256, 11-24-2014)
A. The owner or operator of an FSE which is required to pass wastewater through a grease interceptor or other grease removal facilities shall operate and maintain the grease interceptor so that wastewater discharged from the grease interceptor shall not exceed one hundred milligrams per liter (100 mg/l) - total FOG.
B. The owner or operator of the FSE shall cause the grease interceptor to be cleaned as hereinafter required when FOG and solids reach twenty five percent (25%) of the design liquid level of the grease interceptor, or sooner if necessary to prevent carry over of grease from the grease interceptor into the city sanitary sewer system. Interceptors shall be cleaned at least quarterly unless a longer cleaning interval is approved by the superintendent. If the owner or operator of the FSE, or an employee of the owner or operator, has obtained a waste hauler's license and has completed, to the satisfaction of the superintendent, the course of training offered by waste management services in the cleaning of grease interceptors, such person or persons may clean the grease interceptor. Alternatively, the owner or operator of an FSE may employ a liquid waste hauler licensed by waste management services pursuant to section 4-3E-2 of this code to clean the grease interceptor, provided that the liquid waste hauler personnel performing the grease interceptor cleaning has satisfactorily completed a course of training on grease interceptor cleaning offered by waste management services.
C. Any person who cleans a grease interceptor shall have received the appropriate training through waste management services and shall clean the grease removal system in accordance with the following procedures and requirements. The person cleaning the grease interceptor shall:
1. Completely empty and remove the contents (liquids and sludge) of all vaults of the grease interceptor, and remove the grease mat and scrapings from the interior walls.
2. Not deposit waste and wastewater removed from a grease interceptor back into the grease interceptor from which the waste or wastewater was removed or into any other grease interceptor, for the purpose of reducing the volume of waste and wastewater to be disposed of.
3. Not introduce enzymes, emulsifying chemicals, hot water or other agents into a grease interceptor to dissolve or emulsify grease or as a grease abatement method. Introduction of bacteria as a grease degradation agent is only permitted with prior written approval by the superintendent.
4. Dispose of waste and wastewater removed from a grease interceptor at the city operated disposal station or at a facility approved for disposal of such waste by the superintendent. Waste and wastewater removed from a grease interceptor shall not be discharged to any private sanitary or storm sewer or to the city sanitary or storm sewer system.
5. Not use an automatic grease removal system to clean a grease interceptor without prior written approval of the superintendent. If the use of an automatic grease removal system is approved, it shall be operated in a manner that the grease wastewater discharge limit, as measured from the system's outlet, is consistently achieved.
D. If grease interceptor cleaning is performed by a licensed waste hauler, the owner or operator of the FSE shall witness all cleaning and maintenance activities to verify that the grease interceptor is being fully cleaned and properly maintained according to the requirements of this section. The waste hauler shall provide a copy of the disposal receipt for all waste and wastewater removed from a grease interceptor to the owner or operator of the FSE. As part of each cleaning of a grease interceptor, the owner or operator of the FSE, or the licensed waste hauler employed by the owner or operator, shall at a minimum perform and record the following maintenance activities:
1. Check that the sanitary "tees" on the inlet and outlet sides of the grease interceptor are not obstructed, loose, or missing.
2. Verify that the baffle is secure and in place.
3. Inspect the grease interceptor for any cracks or other defects.
4. Check that lids are securely and properly seated after completion of cleaning.
E. The superintendent may make exceptions to the above requirements, or may approve alternative operational requirements or cleaning and maintenance methods, provided that such exceptions or approvals shall be made in writing by the superintendent. (Ord. 5256, 11-24-2014)
A. Required Records: The owner or operator of an FSE which is required to pass wastewater through a grease interceptor or trap shall maintain a written record of grease interceptor or trap maintenance, including a log showing the dates upon which the grease interceptor or trap was inspected and the estimated amount of FOG present in the grease interceptor or trap at each inspection, the date upon which waste and wastewater was removed from the grease interceptor or trap and disposed of, and the location and means of such disposal of waste and wastewater, and the name and employer or the person or persons performing each of said tasks. The log shall further include a record of the placement of any approved or unapproved additive into the grease interceptor, grease trap or building sewer on a constant, regular or scheduled basis, including the type and amount of additive placed on each such occasion. Only additives approved by the superintendent pursuant to subsection 8-3E-8C3 of this article may be used in a grease interceptor.
B. Recordkeeping: The log shall at all times be kept and maintained on a day to day basis, so as to show a record of waste and wastewater removal, waste and wastewater disposal and approved additive placement. All such records shall be kept secure at the premises of the FSE for a continuous period of three (3) years and shall be made available for nonroutine inspection by the city, the superintendent and the city's operating contractor, or the employees and agents of any of them, at any time during normal business hours. (Ord. 5256, 11-24-2014)
The owner or operator of an FSE shall:
A. Provide, operate and maintain, at its expense, safe and accessible monitoring facilities (such as a suitable manhole), and shall make such monitoring facilities available for inspection, and for sampling and flow measurement of the building sewer or internal drainage systems. There shall be ample room in or near such monitoring facility to allow accurate sampling and preparation of samples for analysis.
B. Allow personnel authorized by the superintendent, bearing proper credentials and identification, to enter upon or into any building, facility or property housing an FSE at any reasonable time and without prior notification, for the purpose of inspection, observation, measurement, sampling, testing or record review, in accordance with this article.
C. Open any grease interceptor, upon request by the superintendent's authorized representative, for the purpose of confirming that maintenance frequency is appropriate, that all necessary parts of the installation are in place, including, but not limited to, baffles influent and effluent tees, and that all grease interceptors and related equipment and piping is maintained in efficient operating condition.
D. Accommodate compliance inspections and sampling events by the authorized representatives of the superintendent. Staff may conduct routine inspections and sampling events of any FSE. Nonroutine inspection and sampling events shall occur more frequently when there is a history of noncompliance with this article and when blockages occur in the city's sanitary sewer system downstream of the FSE.
E. Be responsible for all cleaning and recordkeeping associated with the FOG program. If during any inspection the city determines the records of the FSE or waste hauler are deficient or have been falsified, the FSE and/or the waste hauler may be subject to enforcement actions or other available remedies in accordance with other sections of this article. (Ord. 5256, 11-24-2014)
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